Winthrop Center | 115 Winthrop Square | Financial District

Interesting that the USGS chooses SF as it's poster child;

https://earthquake.usgs.gov/learn/topics/geologicmaps/liquefaction.php

Liquefaction Susceptibility

Liquefaction is a phenomenon where saturated sand and silt take on the characteristics of a liquid during the intense shaking of an earthquake. The highest hazard areas are concentrated in regions of man-made landfill, especially fill that was placed many decades ago in areas that were once submerged bay floor. Such areas along the Bay margins are found in San Francisco, Oakland and Alameda Island, as well as other places around San Francisco Bay. Other potentially hazardous areas include larger stream channels, which produce the loose young soils that are particularly susceptible to liquefaction.

Google Earth File

This layer shows the varying susceptibility in different parts of the region. Susceptibility is delineated in five units from “Very High” to “Very Low” hazard. Roughly one quarter of the San Francisco Bay region may be exposed to liquefaction—the area mapped in the “Very High”, “High” and “Moderate” categories makes up about 25% of the 9-county region.


To follow up on Weigh's post about landfilling: Keep in mind, the USGS makes it sound like man made landfill is the area of greatest concern. But all alluvial sediments of the western Sierra's are highly susceptible. When the Big One hits the LA basin, you may hear about rolling waves and sand geysers.
 
Walked by the site this morning:
L6cuVpN.jpg
 
Also some interesting steel laid down on site. Some very large rebar "boxes" too large to fit in one of the slurry rig holes and a number of I beams festooned with bolts.
 
I saw somewhere on FB that the slurry wall is supposed to be finished and they would start excavating in September so we should see more visible phases very soon
 
I wish these guys had a Oxblue webcam. These types of projects are fascinating to me to watch and see how they wrestle with mother nature to put up a skyscraper.
 
^^Nice image of old soon to meet new.
i wonder how far they might be along.
 
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I would like to point out they started significant foundation work for this project around September/October of last year... prep work began Spring of 2018.
 
I walked through here last night.... the footprint feels huge in this tight-knit neighborhood; Imagining this unorthodox shaped tower emerge to be one of the tallest in town is exciting!
 
^^ and provide a place to build the corporate office park plaza.
 
^^Well said. As currently planned. Let's hope it evolves...
 
cburns said:
I walked through here last night.... the footprint feels huge in this tight-knit neighborhood; Imagining this unorthodox shaped tower emerge to be one of the tallest in town is exciting!
Click to expand...
Cburns- This, the Hub on Causeway, Bulfinch Place -- will be positively [one hopes] transformative in the mold of the Pru complex we are living in a rare time in Boston let's enjoy the next couple of years

Possibly the same will be able to be said about the Back Bay Station project and the South Station Project -- when they actually break ground [this cycle or the next]
 
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